<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main" v-if="fruitList.length > 0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div v-for="(item, index) in fruitList" :key="item.id" class="tr" :class="{ active: item.isChecked }">
              <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
              <div class="td"><img :src="item.icon" alt="" /></div>
              <div class="td">{{ item.price }}</div>
              <div class="td">
                <div class="my-input-number">
                  <button :disabled="item.num<=1" class="decrease" @click="remove(item.id)"> - </button>
                  <span class="my-input__inner">{{ item.num }}</span>
                  <button class="increase" @click="add(item.id)"> + </button>
                </div>
                <!-- <button class="decrease"
                  :disabled="item.num <=1"
                  @click="item.num--"> - </button>
                  <span class="my-input__inner">{{item.num}}</span>
                  <button class="increase" @click="item.num++"> + </button> -->
              </div>
              <div class="td">{{ item.num * item.price }}</div>
              <div class="td" @click="del(item.id)"><button>删除</button></div>
            </div>
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="isAll" />
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{total}}</span></span>
            <!-- 结算按钮 -->
            <button class="pay" >结算{{totalPay}}</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      // 读取值
      const defaultList=[
            {
              id: 1,
              icon: './img/火龙果.png',
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: './img/荔枝.png',
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: './img/榴莲.png',
              isChecked: false,
              num: 3,
              price: 40,
            },
            {
              id: 4,
              icon: './img/鸭梨.png',
              isChecked: true,
              num: 10,
              price: 3,
            },
            {
              id: 5,
              icon: './img/樱桃.png',
              isChecked: false,
              num: 20,
              price: 34,
            },
          ];
      const app = new Vue({
        el: '#app',
        data: {
          // 水果列表
          fruitList: JSON.parse(localStorage.getItem("fruitList"))||defaultList
        },
        methods:{
        del(id){
          this.fruitList=this.fruitList.filter(v => v.id !==id)
        },
        add(id){
          const fruit=this.fruitList.find(v=>v.id===id)
          fruit.num++
        },
        remove(id){
          const fruit=this.fruitList.find(v=>v.id===id)
          fruit.num--

         
        }
        },
        computed:{
        isAll:{
          get(){
            return this.fruitList.every(v=>v.isChecked)
          },
          set(value){
            this.fruitList.forEach(v=>v.isChecked=value)
          }
          },
          // 总价
          total(){
            return this.fruitList.reduce((sum,item)=>{
              if(item.isChecked){
                return sum+item.num*item.price
              }else{
                return sum
              }
            },0)
          },
          // 选中的
          totalPay(){
          return this.fruitList.reduce((sum,item)=>{
            if(item.isChecked){
             return sum+item.num 
            }else{
              return sum
            }
          },0)
          }
        },
        watch:{
          fruitList:{
            handler(){
              localStorage.setItem('fruitList',JSON.stringify(this.fruitList))
            },
            deep:true,
          }
        }
        
      })
    </script>
  </body>
</html>
